Gearing.



Bf. SEYMOUR ammala. APPUCAUGN min o. 1. ien.

Patentd Sept. 3

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il@ PATENT FFXQ,

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application inea nemer i, i917. seriai'iro, letras.

To all wftom t 'may concern.'

Be it known that I, BENJAiwIni F. Snr- Moim, a citizen of the -United States, resid' ing at Denver, in the count of 'Denver and State of Colorado, have invented certain" new and useful Improvements in Gearing, of which the following 1s a specificationD My invention relates to cert-am new and useful improvements in gearing, lby which.

one part is .driven by another, and the invention has particular relation to the construction or formation of the teeth and bodies ofintermeshing gears, as I will here inafter describe and claim.

A leading object of the present invention is to so construct the abutting 'ends lof the teeth of interlockable gears that all atsurfaces are dispensed with and a mere point or edge Contact is made between the gears of the driving and driven members and which point is maintained during the entire period that the teeth of one gear are' riding over or along the teeth of the other gear, during the shifting of one gear relatively to the other and until the teeth of one gear become alined with the interspaces between the teeth of the other gear when driving contact between the gears is effected. This' construction overcomes the tendency of the gears to chatter when shifting from one speed or position to another, and it rglieves the gears of much of the wear and strain which :heretofore have been placed on drivinggears.

In the accompanying drawings forming art of this application and 1n which similar letters of reference indicate like parts in the several views;

Figures l, 2, 3, L and 5, illustrate plan views of single teeth of a driven and driving' gear in abutting relation and showing theprogressive action of the teeth of one gear along the end of the teeth of the other gear until said gears arc finally brought into operative driving-connection.

Fig.- 6 is a perspective view of a fragment of a gear showingr a plurality of teeth with inclined end walls.

In carrying out my invention, I 'form the gears in the usual manner and for present urpo'ses the part, A, may represent a single laowe'r tooth ofa driving-gea13fvvhich in practice will be suitably 'mounted for end'- iwisemovement, toward lancla from 'the testing Specification ef Letters Patent,

Qatented Sept.,

B, of the opposjn or drivenniember. 'In

practice, each'of .he teeth, A and B, will all abutting atjsurfaces or points ot con tact between the tapered ends of the teeth,

A and B, of the driving and driven-member respectively, l. preervthat the taper or angle which is given theends of the teeth the opposed partsfshall vary; in other words, that the angle of the end of the teeth or one part shall be greater than the angle giventhe adjacent surface of the companion tooth, as illustrated in Figs. l to 3 inclusive, since this provides an edge bearin for the teeth, A, ofthe shiftable gear an avoids all flats and enables the gears, A and B, to be broughtinto sliding contact and. finally into full driving connection, as shown in Fig. 4, to the exclusion of the chattering and burring which are usually present in gears having fiat-surfaces Which .are brought vinto direct engagement when the gears of the driving-member are shift-` tapering inwardly towardl the front of the tooth, in the case of the driven member and each end wall diverging toward the front or widest portion of the tooth in the case of the driving member.

e, este,

The result is,l there-l tore, that the driving member Wilhafter the initial or abutting contact With the teeth of the driven member, slide over the inclined surface of the latter toward the-front endl and this movement will be progressively continued until the high point or edge on the end 'of the driving tooth escapes the low point on the inclined surface of the driven',

member, when said low point maintains its single edge contact with the declining' wall or inclined surface onA the end'of the t0oth of the driving member and continuesjto ride thereon until thel tooth ofthe driving-noemberbeoomes aline'd withfthe interspace be tween) adjacent teeth of'the'drven meinte? when said driving tooth may be shi'tted laterally into said space so thatv the widened faces of the driving and driven teeth will be in full driving contact, as shown in'lig. 4. During this movement of the tooth of the driving member from the position shown in' Fig. l, to that shown inv Fig, 3, inclusive, the tooth or" the dri ving member will be progressively directed toward and into the aforesaid space, and yconsequently when the front corner of thtooth of the driven inember escapes the rear cor-ner of the tooth of the driving member, this latter member will have been entered partly into the space betiveen adjacent teeth of the driven member land just back of the Wide rear Wall thereof, so that the tooth of the driving member may be readily shot into its driving conneer- Jtion, as shown in Fig'. 4.

The Construction described is simple and results almost/jr entirely from the cutting away of the` end Walls o1 the teeth of the driving and driveninenibers so as to make va riant inclined Contact surfaeesover which the teeth of the driving member may readily slide without chattering movement or noise, or burring, tir-otherwise injuring the teeth.

The toothed construction herein described,

30 is a division of my prior application for variable speed transmission mechanism tiled September S, 19153, Serial Number 7i* f3?.

Having thns desrribed my invention what I-elaim as nevv and desire to secure by Letters Patent is:

1. In gearing, the eombination oi driving and driven gears, each ot said gears having teeth the ends ot' whieh are ont at variant angles to avoid Hat surfaces of Contact on entering into mesh.

2, Ain gearing, the combination ot driving and driven gears. eaeh of said gears ha ving; teeth with beveled ends, .the bevels on the adjacent ends of laterally alined eti-acting; teeth beingy eut at differing angles whereby oni)Y narrow edges ot' sliding vContact lare provided between the surt'aees of 'eo-acting teeth and flat. surfaces of Contact on said teeth are avoided. p 3. In gearing', the combination ot' driving and driven gears, each of said gears having teeth with ends diverging toward the driv ing,T faces oi vsaid teeth, the inelines on the" ends of opposed teeth being at variant angles to provide substantially a narrow edge on one tooth for slidable Contact along the inclined surface ot' the companion tooth.

n testimony whereof I aflix my signature.

BENJAMIN F, SEYMOUR, 

